Democrats have something to worry about in their Florida Senate primary. Real estate tycoon Jeff Greene (D) has leapfrogged Rep. Kendrick Meek (D-Fla.) and now leads by 10 points. 

Greene has a 33 to 23 percent advantage over Meek, while former Miami Mayor Maurice Ferre (D) is at 4 percent in a new poll by Quinnipiac University poll released Thursday.

The only bright spot for Meek was that 35 percent of the 782 likely Democratic primary voters are undecided and 54 percent of those who named a candidate said they could change their mind. The survey was conducted July 22-27.

Meek was leading Greene 29 to 27 percent in a June 10 poll. But Greene has kept up his multi-million dollar ad blitz, and Meek was only able to respond this week with his first TV spot.

"If there was any doubt that enough money can make a political unknown into a frontrunner, the Democratic Senate primary and the Republican primary for governor should lay them to rest," said Peter Brown, assistant director of the university's polling institute, said in a statement.

Meek still has time to turn it around — the primary is Aug. 24 — but Democrats could be looking at a scenario where they have to woo former Republican Charlie Crist into the caucus.